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ElenaW [278]
3 years ago
13

Which of the following is true concerning the anatomy of a skeletal muscle fiber?

Biology
1 answer:
Vesna [10]3 years ago
8 0

The correct answer is: A. Myofibrils contain thick and thin filaments.

Skeletal muscle cells are called muscle fibers because of their long and cylindrical shape. The plasma membrane of muscle fibers is sarcolemma, the cytoplasm is sarcoplasm, and the smooth endoplasmic reticulum sarcoplasmic reticulum (SR) Sarcoplasmic reticulum is specialized becaused it is involved in the process of contraction, so it stores, releases, and retrieves calcium ions.  

The functional unit of a skeletal muscle fiber is the sarcomere which consists of highly organized contractile myofilaments actin that are thin filaments and myosin (thick filaments), together with other support proteins.  

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NikAS [45]
(I'm not 100% positive on this) Dinosaurs, many chickens and birds are related to dinosaurs
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3 years ago
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Let P = purple flowers and p = white, and T = tall plants and t = dwarf. What combinations of gametes could be produced by a het
kirill [66]

Answer:

The combinations of gametes that could be produced from heterozygous individuals for both traits are PT, Pt, pT and pt.

Explanation:

An individual is heterozygous for two traits, flower color and stem height, with a PpTt (dihybrid) genotype and a phenotype showing the dominant traits, purple flowers and tall stem.

The genes of this individual for the above-mentioned traits contain different alleles, and taking into account the independent segregation of characters, the alleles present in its gametes could be:

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Therefore, the traits of its offspring will depend on the alleles for those traits present in the gamete to which they are combined.

6 0
3 years ago
​the surgical creation of an opening between the colon and body surface is known as a/an _____.
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6 0
3 years ago
Which evidence from King's speech is most relevant in supporting the claim identified in Part A?
saw5 [17]

Answer:

"...for many of our white brothers, as evidenced by their presence here today, have come to realize that their destiny is tied up with our destiny."

(A)

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3 years ago
Help ASAP will give brainilest
Blababa [14]

The correct answer is B. Pinna because auris externa is the  external portion of the ear, which is called auricle ( also known as pinna ).

* Hopefully this helps:) Mark me the brainliest:)!!

<em>∞ 234483279c20∞</em>

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